Tail-screw for carpenters  benches



(No Model.)

C. UNGBRMANN.

TAIL SCREW FOR GARPENTBRS BENGHES. No.,330,64s.

Patented Nov. 1'7, 188.5.

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NITED STATES CONRAD UNGERMANN, OF DAYTON, OHIO.

TAIL-SCREW FOR CARPENTERS BENCHES.

SPECIFICATION forming part of Letters Patent No. 330,643, dated November 17, 1885.

Application led August 15, 1885. Serial No. 174,523. (No model.)

To all whom t may concern:

Be it known that I, CONRAD UNGERMANN, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented a certain new and useful Improvement in Tail- Screws for Carpenters Benches; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it apperl tains to make and use the same, reference= l with said clamp-head is effected by the pin K.

being had tothe accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in tail-screws for carpenters7 benches, which in general features are like those in use, and with special novel features that will be hereinafter fully described and claimed.

The mechanism is illustrated in the accompanying drawings, in which Figure I is a perspective of the improved tail-screw or benchclamp. Fig. II is a section on the line tof the clamp-head and inner end of the screw. Fig. III is a transverse section of the bench and the nut which is attached to the same, the section being on the line x.

Similar letters designate like parts throughout the several views.

J, Fig. III, .represents a portion of a carpenters bench, it being a section of the edge of the rear portion. The top board, L, is slotted for the passage of the clamp-head B. On the under side of the top board are attached the blocks I I, and to which is iixedly attached the nut F. The inner surfaces of these blocks are grooved to receive the slides N of the clamp-head. The clamp-head is hollow, for the reception of the adjustable clamp H. A clamp of corresponding form is used in a series of holes in the bench on a line With the aforesaid slot. e

A is a wooden brace,and E is an iron brace, which hold the clamp-head and the head C in a xed relation. The head G,which supports the handle M and the screw D, are united through the head (land the shoulders of these parts prevent any longitudinal movement of the screw, while the same is free to move about its axis, and in this particular is identical with ordinary bench-clamps.

At Fig. Il is a section of the clamp-head and the inner end of the screw. The connection rIhis pin is passed through an orifice in the rear and enters a circular chamber on the side of the vertical orifice of the clamp-head, and entering an orifice in the screw it is there secured by a key.

The operation is the same as the ordinary cabinet bench clamp. The article to be clamped is placed between a bench-pin and a like pin or clamp held in the hollow of the clamp-head, and the screw is used to give the requisite pressure,as the turning of the screw carries said clamp-head.

Having fully described my invention, what I claim,and desire to secure by Letters Patent, 1s-

In a carpentcrs bench-clamp, the clamphead B, with slides N, for the grooved blocks, central orifice for the adjustable clamp,and circular recess for the bearing-pin K, for attachment to the screw, in combination with braces A E and nut F, fixedly attached to said bench, substantially as set forth.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

CONRAD UN GERMANN.

Witnesses:

B. PICKERING, C. A. WALTMIRE. 

